1. Hatching asynchrony as a parental reproductive strategy in birds: a review of causes and consequences

   • Ewa Węgrzyn
   • Wiktor Węgrzyn
   • Konrad Leniowski

   Review Open access 31 March 2023 Pages: 477 - 497

2. A giant raptor (Aves: Accipitridae) from the Pleistocene of southern Australia

   • Ellen K. Mather
   • Michael S. Y. Lee
   • Trevor H. Worthy

   Original Article Open access 15 March 2023 Pages: 499 - 526

   

3. The effects of temporally distinct light pollution from ships on nocturnal colony attendance in a threatened seabird

   • Martin Austad
   • Steffen Oppel
   • Petra Quillfeldt

   Original Article Open access 28 March 2023 Pages: 527 - 536

   

4. The presence of an invasive bird, the Common Starling, in an urban landscape: habitat use and relationships with other bird species

   • Lucía Ibañez
   • Facundo X. Palacio
   • Diego Montalti

   Original Article 17 February 2023 Pages: 537 - 546

   

5. Frequent duets, rare choruses, and extremely rare solos: year-round singing behavior in Chubb’s Cisticola

   • Michał Budka
   • Marta Piasecka
   • Tomasz Stanisław Osiejuk

   Original Article Open access 26 February 2023 Pages: 547 - 559

   

6. Young, wild, and free—Subadult White-naped Crane (Antigone vipio) exhibit wider home range movements than breeding adults during the summering period

   • Ming Gao
   • Baasansuren Erdenechimeg
   • Yumin Guo

   Original Article 02 March 2023 Pages: 561 - 572

   

7. Regime shift and changes in sediment morphology driven by sea level rise affect abundance of migratory waders

   • Karsten Laursen
   • Thomas Bregnballe
   • Anders Pape Møller

   Original Article Open access 03 March 2023 Pages: 573 - 582

   

8. Co-occurrence with Greylag Geese Anser anser and other factors affecting vigilance in White‑fronted Geese Anser albifrons during their spring staging in Central Europe

   • Michał Polakowski
   • Monika Broniszewska
   • Zbigniew Kasprzykowski

   Original Article Open access 25 March 2023 Pages: 583 - 590

   

9. The uropygial gland of the Great Cormorant (Phalacrocorax carbo): I. Morphology

   • Nadine Stangier
   • Sandra Sandhöfer
   • Claudia Distler

   Original Article Open access 11 January 2023 Pages: 591 - 603

   

10. The uropygial gland of the Great Cormorant (Phalacrocorax carbo): II. Biochemical analysis of the uropygial secretion

    • Jonas Holste
    • Carolin Mügge
    • Stefan Schulz

    Original Article Open access 05 May 2023 Pages: 605 - 619

    

11. Plasma chemistry and hematology reference values in wild nestlings of White-tailed Sea Eagles (Haliaeetus albicilla): effects of age, sex and hatching date

    • Miguel Ferrer
    • Rhian Evans
    • D. Philip Whitfield

    Original Article Open access 17 March 2023 Pages: 621 - 628

    

12. Variation in plasma protein levels in House Finches (Haemorhous mexicanus): effects of season, disease state, and urbanization

    • Dean J. Drake
    • Kevin J. McGraw

    Original Article 23 March 2023 Pages: 629 - 638

    

13. Exposure to sulfur in soil explains pigmentation by pheomelanin in birds inhabiting Iceland

    • Sol Rodríguez-Martínez
    • Ólafur Arnalds
    • Ismael Galván

    Original Article Open access 25 February 2023 Pages: 639 - 649

    

14. The visual fields of the Harpy Eagle (Harpia harpyja)

    • Anna E. Brewer
    • Wanderlei de Moraes
    • Bret A. Moore

    Original Article 22 March 2023 Pages: 651 - 658

    

15. Size-assortative mating in a long-lived monogamous seabird

    • Francesca Visalli
    • Federico De Pascalis
    • Jacopo G. Cecere

    Original Article 27 March 2023 Pages: 659 - 667

    

16. Parental food provisioning and nestling growth under Philornis downsi parasitism in the Galapagos Green Warbler-Finch, classified as ‘vulnerable’ by the IUCN

    • Courtney L. Pike
    • Barbara Kofler
    • Sabine Tebbich

    Original Article Open access 18 February 2023 Pages: 669 - 676

17. Assessing genetic diversity patterns at neutral and adaptive loci to inform population reinforcement of an endangered migratory vulture

    • Anastasios Bounas
    • Victoria Saravia-Mullin
    • Konstantinos Sotiropoulos

    Original Article Open access 10 February 2023 Pages: 677 - 688

    

18. Breeding biology of the African Pygmy Falcon: long-term variation and seasonal decline in breeding performance of an arid zone raptor

    • Olufemi P. Olubodun
    • Anthony M. Lowney
    • Robert L. Thomson

    Original Article Open access 30 March 2023 Pages: 689 - 704

    

19. Importance of shallow river topography for inland breeding Common Terns

    • Miloš Martinović
    • Mladen Plantak
    • Jelena Kralj

    Original Article 14 March 2023 Pages: 705 - 716

    

20. Plant consumer innovation in skuas

    • Samara Danel
    • Gaël Bardon
    • Francesco Bonadonna

    Short Communication 09 March 2023 Pages: 717 - 719

    

21. Absence of song suggests heterogeneity of vocal-production learning in hummingbirds

    • Amanda Monte
    • Maria Luisa da Silva
    • Manfred Gahr

    Short Communication Open access 21 March 2023 Pages: 721 - 727